His 18-year-old son Dennie, said he was ‘worried sick’ about his dad who he said had been on a ‘downward spiral’

He said: ”My dad had been travelling with his girlfriend but they had an argument then he went off alone. He’s been on a downward spiral since that.

”The police found him naked in the street but he had already been robbed twice and lost his phone, money and passport. I think the third time he was robbed and somebody stole his clothes. It’s not like him to just strip naked.

”He could have been drunk or he could have had his drink spiked, I don’t believe he would have taken drugs but he might have done. Something has happened for him to just flip out.

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”Right now we’re just worried sick and we can’t get in touch with him. We’ve contacted the foreign office and the embassy but they haven’t been able to help.

”The most we know is that he has been arrested and detained for his own safety. We just want him home and safe.”

Dennie said that Jon arrived in the country last Saturday and had planned to travel to neighbouring Thailand.

But it is not known if he will return home or when he will be released by the police.